With his spectacles and sombre grey suit, Pavan Kumar Rai looks every inch the professional senior Indian civil servant.
His low-key, bureaucratic manner fits perfectly with the anodyne name of his employer: the Research and Analysis Wing.
Yet Mr Rai and his organisation were thrust into the spotlight this week, after explosive allegations from Justin Trudeau that India assassinated Sikh separatist leader Hardeep Singh Nijjar on Canadian soil.
